Typewriting-machine



B. C. STlCKNEY.

TYPEWRITING MACHINE.

APPLICATION FILED SEPT. 21, 1917.

Patented Mar. 1, 1921,

l V/ f/vesses UNITED STATES PATENT omen.-

BURNHAM C. STICKNEY, OF ELIZABETH, NEW JERSEY, ASSIGL TOR TO UNDERWOODTYPEWRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

'ryrnwnrrmamaonrnn Specification of Letters Patent.

Patented Mar. 1, 1921.

Application filed September 21, 1917. Serial No. 192,469.

T 0 all whom it may concern.

Be it known that I, BURNHAM O. STICK- NEY, a citizen of the UnitedStates, residing in Elizabeth, in the county of Union and State of NewJersey, have invented certain new and useful Improvements inTypewriting-Machines, of which the following is a specification.

This invention relates to a universal linespacer f6;- the platen of atypewriting machine, to be capable .of fine or universal regulation ofthe spacing of vthe typewritten lines.

Upon a drum I wind a flexible clutch band, preferably two or more times,to secure a firm grip thereon by reason of the extent of the winding.The drum may be connected to the platen, although the invention iscapable of reversals of parts in various ways.

The usual line-spacing lever is connected to tighten the band upon thedrum, and then by means of the band to turn the drum and platen, to anextent whichis universally or minutely variable. At the line spacing operation, the line-space lever acts upon one end of the band to tend todraw it around the drum, while a spring opposes the tendency of theother end of the band to yield to the pull of the band. Hence, the band,by reason of its self-binding tendency, be-

comes suiiiciently tight upon the drum to enable the band to be employedfor rotating the drum and platen, and to overcome the inertia of theseparts without slipping in starting their rotation.

The line-spacing mechanism and platen are arrested by means of a stop,which engages and positively arrests the free or dragging end of theband, so that the shock of arresting the hand of the operative issustained by the entire band, which thereby is caused to bind itselfeven more firmly on the drum, to counteract the tendency of the platento overthrow at this time, due to its momentum. In other words, the gripor control of the band or driving clutch is momentarily increased as theplaten is arrested.

The stop which arrests the line-spacing mechanism and the platen, ispreferably fixed, to secure effectiveness, and the regulation of theextent of line-space movement is preferably secured by means of alinespace regulator which shifts the entire clutch mechanism relativelyto said fixed stop, to any predetermined extent within the maximum rangeof adjustment provided. Upon release of the line-space handle, it isreturned to normal position by means of a spring, and the clutch band ispermitted special brake is provided, which holds the drumand platenduring the early part of the return stroke of the line-space handle orlever. -Upon the conclusion of the return stroke of the line-spacelever, said brake is released, as 1t is no longer needed, since, by thistime, the clutching band has relaxed and released the drum.

The l1ne-space lever preferably has a uniform throw and picks up theclutch mechanism early or late in its stroke according to the positionof adjustment of the linespace regulator. l I

S1nce the line-space lever and a slide operated thereby have uniformstrokes regardless of the regulation of the line-spacing throw, theseparts may be used to throw a brake into and out of use, the brake beingthrown into use at the conclusion of the drive, and thrown out of use atthe conclu- S1011 of the return stroke of these parts; this effect beinguniform for all line-space movements' secured by the adjustment of theregulating devices.

The spring, hereinbefore mentioned, for opposing the pull on the clutchband, also serves to restore the free or dragging end of the clutch bandto normal position. This spring may be of light tension so as not tohave an undue tendency to bind the band and retract the drum and platenduring the retraction of the line-space lever. Moreover, this spring mayitself constantly operate a separate brake, which engages the drum tohold the platen stationary during the writing of the line, as well as toaid in preventing overthrow of the platen at the conclusion of theline-space throw. Provision is made for adjusting the pressure of thisseparate brake, so that it may be relatively strong while the pull ofthe spring upon the dragging end of the clutch band may be relativelylight.

- sition.

Other features and advantages will here inafter appear.

In the accompanying drawings,

Figure 1 is a side elevation, showing my invention as applied to anUnderwood typewriting machine.

Fig. 2 is a front elevation of the same. Fig. 3 is a perspective view ofthe parts shown in, Fig. 1.. v

Fig. 4 is a side elevation, showing some of the parts shown in Fig. 1,in operated po- 7 Fig. 5 is a perspective View, showing a modified formof the driving band shown in Fig. 3. I

Fig. 6 is.a front detail view of another Suitable form'of. driving band,which may be used when a very compact arrangement is desired. 7

In an Underwood typewriting machine, types 9 strike upwardly andrearwardly against a platen 10, mountedon axle 11, rotatably mounted ina left-hand end plate 12 and a right-hand end plate, not shown. Forrotating the platen line by line, in the course -of typewriting, aline-space handle 13, provided with a finger-piece 14, is pivotallymounted on the frame or carriage of the machine at 15, and is providedwith an arm 16 to drive a slide 17 rearwardly. The slide the form of aflexible chainIor band 21 which is wrapped more than once (preferablymore than twice) around a friction drum 22 secured to'the platen axle11, and forming a line-space wheel. This band or chain 21 is drawntightly around the friction drum 22 by means of an arm 23 pivotallymounted upon the platen axle 11. The leading and 24 of the band isconnected to the arm or lever 23 by means of a pin 25. The band-carryingarm 23 extends .up into the path of an operating pin 26 secured to theline-space slide 17 The other or dragging end 27 ofthe band 21 issupported upon a pin 28, on an arm 29 pivotally mounted upon the platenaxle 11.

WVhen the line-space slide 17 is operated by the arm 16 of theline-space handle 13, the pin 26 on said slide engages and moves the arm23. The first movement of the arm 23 causes the band 21 to be drawntightly to the surface of the drum 22, owing to the self-bindingcharacter of the flexible band due to its prolonged winding around thedrum. To favor this tightening of the band, an arm 30, formed upon thearm 29, is provided with a spring 31, forming a drag, which retards ortends to hold said draggingend of the band against movethe clutch band21 and on the brake 32 may be separately adjusted by adjusting the endsof the spring 31 along the lever arm 30 and the brake lever 32, asindicated by the series of holes in these-levers.

After theband is clutched to the drum, the continued movement of theline-space slide 17 causes theplaten to rotate against the resistance ofthe brake 32 and of the spring 31, which, through the lever arms 29 and30,- is connected to the dragging end of said band.

The band 21 may be in the form of a flexible spring metal strip, or maybe a chain of metal links; or it may be of woven metal tape, as shown inFig. 5. The drum 22 may preferably be of fiber or other suitablefriction material, or it may be made of a softer metal than the band. Ifit is desired to have a metal ,drum, then the band may be made of fiber;or fiber links may be assembled in a chain; or a band of materialsofter. than the metal drum may be used. The tape of woven wire may besofter than the drum. If an extremely compact arrangement is desired, athin chain, such as shown in Fig. 6, may be used.

By Winding the band several times about the drum, a very powerfulgripping and binding, winch-like action is obtained, since the band isself-binding, and a light spring. 31 may hold the free end againstmove-- ment, while the band is being tautened upon the drum. A greatdeal of-contacting surface can be secured between the driving mechanismand the drum, Without materially increasing the Weight-of the mechanism.

At the conclusion of the drive-stroke, the

arm 29, carrying the dragging end of the band, is arrested by means of'astop fixed to the end plate 12. When this arm 29 strikes said stop 35,the momentum of the driving parts is utilized fully to arrest theplaten, because such momentum tends to cause the leadin end of the bandto carry still farther, ut this (the dragging end of the band beingengaged by a fixed and positive stop), can only tend to cause the bandmore firmly to grip the drum 22. Also, the momentum of the platen itselftends to tighten the clutch band into firmer gripping relation on thedrum. Hence the by the operator, the slide 17 is returned to normalposition by its spring 18. This causes the pin 26 on the slide torelease the driving arm 23, which may, if desired, be retracted by aspring 36 (Fig. 1) connected to an arm 37 formed upon said arm 23. Thespring 31 at this time causes the arm 29, carrying the dragging end ofthe band, to return to normal position, drawing the clutch-band idlyback around the drum,

which is now stationary. The spring 36 renders the band somewhat slack,so that it will the better ride idly over the drum.

The constant brake 32 tends to hold the drum and platen at this time. Asan aid,

7 however, in holding thedrum. and platen against movement when the bandis returning, an auxiliary device may be provided, comprising a brake38, havlng a shoe 39, and pivotally mounted upon a stub shaft 40 securedto the side plate 12. This brake lever is provided with an upstandingarm 41, normally located in the path of a pin 42 at the forward part ofthe line-space slide 17. When the latter approaches'the limit of itsdriving movement, the pin 42 moves the arm 41 and causes the brakeshoe39 to be moved toward the drum. As.

until the clutch-band 21 has returned to' normal position, the brakebeing held during all this time by the notch 46 and the spring 45. Asthe returning slide 17 approaches its normal position, a pin 47 on saidslide engages the arm 41, and restores the brake lever 38 to normalineffective position, in which it is held by the detent notch 44 insprin 45.

It is also noted that since this brake engages the drum before thedrive-stroke of the line-space mechanism is completed, it aids inpreventing overthrow of the platen, as also does the brake 32.

To regulate the extent of line-spacing movement a line-space regulatoris provided, by which the entire clutch mechanism may be adjusted. Theline-space handle and the line-space slide are preferably moveduniformly, irrespective of the. extent of movement which the platenreceives.

A control plate 48, mounted conveniently on platen axle 11, is providedwith-gear teeth 49, meshing with a worm 50 on a shaft 51 mounted in abracket 52, secured to the side frame 12. A suitable fingerpiece 53 isconnected to the shaft 51. A star-wheel 54 is also secured to the shaft51 and coiiperates with a spring 55 to hold the shaft 51 againstaccidental rotation. When it is desired to regulate the movement, thefinger-piece 53 is rotated to move the control plate 48 in either aclockwise or a counterclockwise direction, as seen in Fig.1,

until an indicator 56 is positioned opposite the proper indication on ascale 57 carried by the bracket 52. This scale 57 may be divided intofive divisions, each of which indicates the usual line-space distances,and each of these divisions is divided into five sub-divisions. Thisscale and indicator aid the operator in locating the control plate 48 inposition. The line-space distance may be minutely'varied.

The plate 48 controls the clutch mechanism through the medium of twopins 58 and 59, secured thereto. The pin 58 is arranged to be engaged byand limit the return movement of the arm 29 carrying the dragging end ofthe band, while the pin 59 1s arranged to engage and limit the movementof the arm 37, formed integral with the arm 23 which carries the leadingend of the band 21. It will be seen, therefore, that the pin 58 andthepin 59 limit the forward movement of the bandagainst the tension of thespring 31. Any adjustment of the controller plate48 will varythe normalresting position of the clutch mechanism. If the plate is movedclockwise, as seen in Fig. 1, the amount of movement given to the platenat the next line-space strokewill be increased. This movement of theclutch mechanism, independently of the slidev 17, is possible, becauseof the position of the pin 26 which. operates the arm 23'of the clutchmechanism. This pin 26, in normal position, permits the free movement ofthe arm 23 of the clutch mechanism within the limit of the mechanism.

Variations maybe resorted to .within the scope of the invention, andportions of the im rovements may be used without others. aving thusdescribed my invention, I claim: 4

1. In a typewriting machine, the combination with a revoluble platen, ofa linespace drum, an axle on which the platen and drum are mounted andline-space mechanism for the platen comprising a line-space nation witha platen, of a line-space wheel cause the band to more firmly-grip theline-- space wheel, said means being arranged to so increasethe bindingaction of the band upon the linerspace wheel at the end of theline-space stroke, that excessive movement,

of the platen is prevented.

3. In a typewriting machine, the combination with a platen, of aline-space wheel connected to said platen, a line-space handle, africtional driving band wound several times about the line-space wheeland normally in a slack condition thereon, means for causing thefrictional driving band to bind to the line-space wheel and then movesaid linespace wheel a predetermined distance, means adapted to arrestthe driving band and simultaneously cause the band to more firmly gripthe line-space wheel, said means i.

being arranged so as to so increase the binding action of the band uponthe line-space wheel at the end of the line-space stroke, that excessivemovement of the platen is prevented, means for returning the drivingband to normal osition and a brake device normally free Ei'om saidline-space wheel but moved into engagement with said line-o space wheelat the end of the line-space stroke, to hold said wheel and thereforethe platen against movement while the driving band is being slackenedand returned to normal osition. 7

4. n a typewriting machine, the combination with a revoluble platen, ofa linespace drum, an axle on which the platen and drum are mounted, andline-space mechanism for the platen comprising a line-space handle, aband wound several times about the line-space drum and normally in aslack condition thereon, means arranged to first draw theband tightlyabout the drum and then rotate the drum a predetermined amount, andmeans for returning the band to normal position after the line-spaceoperation, comprising a spring connected to each end of said band, saidsprings being so arranged as to cause the band to first become slackenedand then be moved to normal position.

5. In a typewriting machine, the combination with a revoluble platen, ofa linespace drum, an axle on which the platen and drum are mounted,line-space mechanism for the platen comprising -a line-space handle, aband wound several times about the line-space drum, an 1 arm pivotallymounted on said platen axle to which the leading end of sald band isconnected, another arm on said platen axle to which the draggingend ofthe band .is connected, means operated by the line-space handle tooperate the first-mentioned arm to cause said arm to first draw the bandtightly about the drum and then rotate the drum, means for returning theband to normal position after the operation of the line-space handlecomprising a spring connected to the arm which is connected to thedragging end of the band, and a spring connected to the leading end-ofthe band to cause the band to be returned in a slackened condition.

6. In a typewriting machine, the combination with a revoluble platen, ofa linespace drum, an axle on which the platen and drum are mounted,line-space mechanism for the platen comprising a linespace handle, aband wound several times about the line-space drum, an arm pivotallymounted on said platen axle to which the leading end of said band isconnected, an

other arm on said platen axle to which the dragging end of the band isconnected, means operated by the line-space handle to operate thefirst-mentioned arm to cause said arm to first draw the band tightlyabout the drum and then rotate the drum, means for returning the band tonormal position after the operation of the line-space handle comprisinga spring connected to the arm which is connected to the dragging end ofthe band, a spring connected to the leading "end of the band to causethe band to be returned in a slackened condition, a normally ineffectivebrake for the platen, and means for automatically rendering the brakeeffective to hold the platen while the band is returned around theplaten.

7 In a typewriting machine, the combination with arevoluble platen, ofline-space mechanism for rotating said platen, said line-space mechanismcomprising a drum connected to the platen, a frictional driving bandwound more than once about said drum to cause the band to beself-gripping on the drum, driving means for drawing on the leading endof the band to cause the band to grip the drum and impart line-spacingmovement thereto, a brake device for holding said platen against turninguntil said band firmly grips the drum, a stop for arresting the draggingend of the band in the line-spacing movement so as to cause the bandmore firmly to grip the drum, and asecond brake device normallyineffective but made effective by said driving means at the end of theline-spacing operation to hold the platen against returning while theband is returned and released from the drum.

8. In a typewriting machine, the combination of a revoluble platen and areciprocating frictionally driving line-space mechanism for said platencomprising a reciprocating slide operated by a line-space handle, adrum, a driving band wound more than once around said drum, arms towhich the ends of the driving band are connected, and a lost-motionconnection between the reciprocating slide and one of said arms.

9. The combination of a revoluble platen,

a drum, a flexible band wound around the drum sufliciently to beself-tightening thereon, a driver connected to one end-of the bandcausing saidband to drive the platen, a returning spring connected withthe dragging end of the band, and adapted to drag on the bandsufliciently during the effective stroke of the driver to render theband selfbinding, a separate returning spring for said driver, meanscontrolled by said driver for detaining the platen during the returnmovement of the band, and means for thereafter automatically releasingsaid detaining means.

10. The combination with a revoluble platen having a drum, of a flexibleband wound more than once around the drum sufficiently to render theband self-binding upon the drum, a manually operable driver, meansconnecting said driver to the leading end of said band to rotate theplaten thereby, a lever connected to the dragging end of said-band, areturning spring for said lever adapted to drag on the band sufficientlyto render it self-binding at the actuation of the driver, and relativelyadjustable stops to regulate the throw of said lever, therebydetermining the extent of line-,

spacing movement of the platen eflected by said band, a fixed stop beingprovided for limiting the return stroke of said driver; said driverbeing constructed to operate during the last part of its driving stroketo drive the band and platen, and the length of stroke of said driverbeing sufficient to accommodate the entire range of adjustment of saidregulatable stop lever.

11. The combination of a revoluble platen, a drum, a flexible band woundaround the drum snfliciently to be self-tightening thereon, a driverconnected to-one end of the band causing said band to drive the platen,a platen brake to constantly oppose rotation of the platen, and a springacting between the brake and the dragging end of the band to operate thebrake and to return the band around the drum.

12. The combination of a revoluble platen, a drum, a flexible band woundaround the drum sufliciently to be self-tightening thereon, a driverconnected to one end of the band causing said band to drive the platen,a platen brake to constantly oppose rotation =the binding effect of theband upon the of the platen, a spring acting between the platen rake andthe dragging end of the and to operate the brake and to return the bandaround the drum, a second brake normally ineffective upon said platen,and means controlled by said driver for bringing the second brake intouse at the conclusion of the driving stroke of said driver,

and for moving said second brake out of use turning spring connectedwith the dragging end of the band, and a platen brake connected withsaid spring to constantly oppose rotation of the platen, means beingprovided for regulating the pressure of said brake eflected by saidspring.

14. The combination with a revoluble platen having an axle, of a drum, aflexible band wound around said drum, an arm pivoted upon said axle andconnected to the leading end of said band, a manually operable driverfor said arm, a second arm upon said axle connected to the dragging endof said band, and a returning spring connected to said second arm andadapted to drag on the arm sufficiently to render the band selfbindingon the drum at the actuation of the driver.

15. The combination with a revoluble platen having march, of a drum, aflexible band wound around said drum, an arm pivoted upon said axle andconnected to the leading end of said band, a manually operable driverfor saidarm, a second arm upon said axle connected to the dragging endof said band, a returning spring connected to said second arm, saiddriver including a lever, and a part operated by said lever and havingmeans to engage the first-mentioned arm.

16. The combination with a revoluble "platen having an axle, of a drum,a flexible band wound around said drum, an arm pivoted upon said axleand connected to the leading end of said band, a manually operabledriver for said arm, a second arm upon said axle connected to thedragging end of said band, a returning spring connected to said secondarm, and means for regulating the stroke of the second arm.

17. The combination with a revoluble platen having a drum, of a flexibleband wound around the drum to be self-tightening thereon, a driverconnected to the leading'end of said band to tighten it upon the drumand thereby drive the platen, means for cotiperating with the other endof the band to arrest the same and thereby cooperate with the band anddriver to increase drum by reason of the sudden arrest of the drivingmembers, and means for draggmg the driver, a spring to return thedriver,

on said other end sufliciently to render the band self-binding at theactuation of the driver.

18. The combinationof a revoluble platen having a drum, a flexible bandwound more than once around the drum to be self tightening thereon, amanually operable driver, a lever connected to the leading end of saidband to pull the same and operableby said driver during the last part ofthe stroke of and a-spring to return the lever.

19. The combination of a revoluble platen having a drum, a flexible bandwound more than once around the drum to be self-tightening thereon, amanually operable driver, a lever connected to the leading end of saidband to pull the same and operable by said driver during the last partof the stroke of the driver, a spring to return the driver, a spring toreturn the lever, and a s ring connected to the dragging portion 0 theband to return the same. i g

20. The combination with a revoluble platen and a drum, of a flexibleband wound more than once around the drum to be selftightening thereon,means connected to the leading end of the band to drive the platenthereby, means connected to the leading end of the band to slacken theband to facilitate its returning around the stationary drum, a stop forthe platen cooperative with the dragging end of the band to increase thegrip of the band on the drum in stopping the platen, means connected tothe dragging portion of the band to retard. the band to cause it to gripthe drum for driving the platen and tending to return the band aroundthe drum, a brake for said platen, and means for automatically renderingsaid brake efi'ective during the return of the flexible band around thedrum; said brake be ing normally ineffective. p v

21. The combination of a revoluble platen, a friction device connectedto said platen for driving the same, a driver for said friction device,a stop for arresting said driver, a normally ineffective brake for saidplaten, and means independent of said stop to enable said driver tobring said brake into action at the conclusion of the driving stroke ofsaid driver.

22. The combination of a revoluble platen a friction device connected tosaid platen for driving the same, a driver forsaid friction device, astop for arrestingsaid driver, a normally ineffective brake for saidplaten, means independent of saidstop to enable said driver to bringsaid brake into action at the conclusion of the driving stroke of saiddriver, and means controlled by said driver on its return stroke forreleasing said brake. a

23. The combination ofa revoluble platen having a drum, a flexible bandwound more than once around said drum to be self-tightening thereon, adriver, means connected to said driver to pull the leading end of saidband, a stop to cooperate with the dragging end of'said band to arrestthe 'band and driver and thereby momentarily increase the bite of theband upon the drum, and a normally ineffective brake for said platencontrolled by said driver to be rendered effective, upon the platen atthe conclusion of the driving stroke of said driver.

24. The combination of a revoluble platen having a drum, a flexible bandwound more than once around said drum to be self-tightening thereon, adriver, means connected to said driver to pull the leading end of saidband, a stop to cooperate with the dragging end of said band to arrestthe band and driver and thereby momentarily increase the bite of theband upon the drum, a normally ineifective brake for said platencontrolled by said driver to be rendered efi'ective upon the platen atthe conclusion of the driving stroke of said driver, and meanscontrolled by said driver upon its return stroke to release said brake.

25. The combination with a revoluble platen, of a reciprocatory driverhaving a uniform stroke, and a friction device where by said driverrotates said platen, means being provided for effecting minuteregulation of the length of stroke of said friction device while thestroke of the driver remains uniform, such'means including a lost-motionoperating connection between the driver and the friction device.

26. 'In a typewriting machine, the combination with a revoluble platen,of a linespacing mechanism comprising a drum connected to the plate-Inaband wound several times around the drum, a driving handle for drawingupon the leading end of the band to tighten the band on the drum andimpart line-spacingmovement to the platen, means connected to thedragging end of the band to retardthe band and cause it to tighten onand grip the drum at the driving stroke of the handle and to tend toreturn the band around the drum to normal position while the drum isstationary at the return stroke of the handle, and means for effectingfine variations in the line-spacing movement imparted to the platen atthe drivin stroke of the handle.

27. n a typewriting machine, the combination with a revoluble platen, ofa linespacing mechanism comprising a drum connected to the platen, aband wound several times around the drum, a driving handle for drawingupon the leading end of the band to tighten the band on the drum andimpart line-spacing movement to the platen,

tions in the line-spacing movement imparted to the platen at the drivingstroke of the handle.

28. In a typewriting machine, the combination with a revoluble platen,of a linespacing mechanism comprising a drum connected to the platen, aband wound several times around the drum, a driving handle for drawingupon the leading end of the band to tighten the band on the drum andimpart line-spacing movement to the platen, means connected to thedragging end of the 'band to retard the band and cause it to tighten onand grip the drum at the driving stroke of the handle and to tend toreturn the band around the drum to normal position while the drum isstationary at the return stroke of the handle, means forholding the drumand platen stationary while the band is being tightened on the drum, andmeans for effecting fine variations in the line-spacing movementimparted to the platen at the driving stroke of the handle.

29. In a typewriting machine, the combination with a revoluble platen,of a linespacing mechanism comprising a drum connected to the platen, aband wound several times around the drum, a driving handle for drawingupon the leading end of the band to tighten the band on the drum andimpart line-spacing movement to the platen, means connected to thedragging end of the band to retard the band and cause it to tighten onand grip the drum at the driving stroke of the handle and to tend toreturn the band around the drum to normal position while the drum isstationary at the return stroke of the handle, means for holding thedrum and platen stationary while the band is being returned around thedrum, and means for efi'ecting fine variations in the line-spacingmovemenuimparted to the platen at the driving strokepf the handle.

30. In a typewriting machine, the combination with a revoluble platen,of a linespacing mechanism comprising a drum connected to the platen, aband wound several times around the drum, a driving handle for drawingupon the leading end of the band to tighten the band on the drum andimpart line-spacing movement to the platen, means connected to thedragging end of the band to retard the band and cause it to tighten onand grip the drum at the driving stroke of the handle and to tend toreturn the band around the drum to normal position while the drum isstationaryat the return stroke of the handle, frictional holding meanstending at all times to hold the drum and platen stationary andproviding for the band being tightened on the drum,-

other holding means supplemental to the first and cooperative therewithto hold the drun and platen stationary while the band is being returnedaround the drum, and means for eflecting fine variations in theline-spacing movement imparted to the platen at the driving stroke ofthe handle.

31. In a typewriting machine, the combination with a revoluble platen,of a linespacing mechanism comprising a drum connected to the platen, aband wound several timesaround the drum, a driving handle for drawingupon the leading end of the band to tighten the band on the drum andimpart line-spacing movement to the platen,

means connected to the dragging end of the band to retard the band andcause it to tighten on and grip the drum at the driving stroke of thehandle and to tend to return the band around the drum to normal positionwhile the drum is stationary at the return stroke of the handle, spacedstops for limiting the line-spacing and return movements of the draggingend of the band, and means for effecting fine variations in the spacingof said stops for correspondingly minutely varying the line-spacingmovement imparted 'to the platen at the driving stroke of the handle.

32. In a typewriting machine, the combination with a revoluble platen,of a line'- spacing mechanism comprising a drum connected to the platen,a band wound several times around the drum, a driving handle for drawingupon the leading end of the band to tighten the 'band on the drum andimpart line-spacing movement to the platen, means connected to thedragging end of the band to retard the band and cause it to tighten onand grip the drum at the driving stroke of the handle and to tend toreturn the'band around the drum to normal position while the drum isstationary at the return stroke of/the handle, frictional holding meanstending at all times to hold the drum and platen stationary andproviding for the band being tightened on the drum, other holding meanssupplemental to the first and cooperative therewith to hold the drum andplaten stationary while the band is being returned around the drum,spaced stops for limiting the line-spacing and return movements of thedragging end of the band, and means for effecting fine variations in thespacin of said stops for correspondingly minute y varying theline-spacing movement imparted to the platen at the driving 7 and drumare mounted, line-space mechanism for the platen comprising a line-spacehandle, a band wound several times.about the line-space drum, an armpivotally mounted on said platen axle to which the leading end of saidband is connected, another arm on said platen axle to which the draggingend of the band is connected, means operated by the line-space handle tooperate the first-mentioned arm to cause said arm to first draw the bandtightly about the drum and then rotate the drum, means for returning theband to normal position after the operation of the line-space handlecomplaten at the driving stroke of the handle.

34. In a typewriting machine, the combination with a revoluble platen,of a linespace drum, an axle on which the platen and drum are mounted,line-space mechanism for the platen comprising a line-space han dle, aband wound several times about the line-space drum, an arm pivotallymounted .on said platen axle to which the leading end of said band isconnected, another arm on said platen axle to which the dragging end ofthe band is connected, means operated by r the line-space handle tooperate the firstmentioned arm to cause said arm to first draw the bandtightly about the drum and then rotate the drum, means for returning theband to normal position after the operation of the line-space handlecomprising a spring connected to the arm which is connected to thedragging end of the band, a spring connected to the leading end of theband to cause the band to be returned in a slackened condition, spacedstops for limiting the movements of the arm connected to the draggingend of the band, means for effecting fine variations in the spacing ofsaid stops for correspondingly minutely varying the line-spacingmovement imparted to the platen at the driving stroke ofthe handle, anda stop for the leading end of the band in its return movement.

, 35. .The combination of a revoluble platen, a drum, a flexible bandwound around the drum sufiiciently to be self-tightening thereon, adriver connected to one end of the band causing said band to drive theplaten, a platen brake to constantly oppose rotation of the platen, anda spring acting between the brake and the dragging end of the band tooperate the brake and to return the band around the drum, means beingprovided for separately and independently adjusting the tension of saidspring on the dragging end of the band and on said brake.

BURNHAM c. STICKNEY;

Witnesses:

CATHERINE A. NEWELL, ARTHUR A. JOHNSON.

